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The gray tank tends to get a grease buildup on the walls preventing the gauges to read the level properly. You probably have the gauges that do not go through to the inside of the tank. Whichever type you have try a product from a company called Roebic Industries, If the problem is residue build this stuff will probably work. You may have to flush several times call the company for specific instructions. I tried all the the solutions suggested on this site but none worked but Roebic. Keep in mind there may be other things going on other than grease or sludge in the tank.

It is more likely that one or more of the tank level sensors have fallen off the side of the gray tank & are lying down next to the bottom edge of the tank itself. [found this out on my '06 Itasca Cambria] If this is the case, the tank will always read full because the upper-most sensor [the "full" indicator] is looking at the tank bottom.

I fixed mine by reaching in with some duct tape & refastening the sensors at the correct heights on the tank(s). Fixed them in 2006 & they are still working fine.....

Inaccurate level readings are quite common. They usually electronically sense when liquid levels are covering conductors. This can be inhibited by 'crud' (technical term) coating the inside of the tank. To remove this crud and keep from building up odors and future problems, here's a few suggestions:

1.) The GEO method of tank cleaning and maintenance. https://sites.google.com/site/cbruni.../site/cbruni/v
Calgon Water Softener Powder can be purchased from Amazon. Double the order to get free shipping and enough for you and a friend. Amazon.com: Calgon Water Softener Powder, 40-Ounce (Pack of 2): Health & Personal Care
2.) Add some Dawn dishwashing liquid to the grey tank, half fill with water and take a trip. The sloshing will help cut grease.
3.) Always have water in black tanks to prevent the 'Pyramid of Poo' that can cause waste to form a blockage. The Calgon helps make water wetter and breaks this up.
4.) Only empty tanks when at least half full, this allows a more complete flush. Dumping too often means strong flow doesn't develop and move things out of the tank.
5.) If you have internal tank flush nozzles, use them to help rinse tank after dumping.